C# 文件夹加密 |
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C# 文件夹加密
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可以加密文件内容，也可以对文件夹本身进行加密，本文对文件夹加密。 一、指定或生成一个密钥 1）指定的密钥  
1 ///
2 /// 密钥，这个密码可以随便指定
3 ///
4 public static string sSecretKey = "?\a??64(?";
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2） 也可以生成密钥
1 ///
2 /// 生成一个64位的密钥
3 ///
4 /// string
5 public static string GenerateKey()
6 {
7 //创建对称算法的一个实例。自动生成的密钥和IV。
8 DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
9
10 // 使用自动生成的密钥进行加密。
11 return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
12 }
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二、调用ZeroMemory 函数从内存中删除Key
1 ///
2 /// 调用该函数从内存中删除的Key后使用
3 ///
4 [DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
5 public static extern bool ZeroMemory(IntPtr Destination, int Length);
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三、加密文件
1 ///
2 /// 加密文件
3 ///
4 /// 待加密的文件的完整路径
5 /// 加密后的文件的完整路径
6 public static void EncryptFile(string sInputFilename, string sOutputFilename)
7 {
8 FileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
9
10 FileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);
11 DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
12 DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
13 DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
14 ICryptoTransform desencrypt = DES.CreateEncryptor();
15 CryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write);
16
17 byte[] bytearrayinput = new byte[fsInput.Length];
18 fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
19 cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
20
21 cryptostream.Flush();
22 fsInput.Flush();
23 fsEncrypted.Flush();
24 cryptostream.Close();
25 fsInput.Close();
26 fsEncrypted.Close();
27 }
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四、解密文件
1 ///
2 /// 解密文件
3 ///
4 /// 待解密的文件的完整路径
5 /// 解密后的文件的完整路径
6 public static void DecryptFile(string sInputFilename, string sOutputFilename)
7 {
8 DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
9 DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
10 DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
11
12 FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
13 ICryptoTransform desdecrypt = DES.CreateDecryptor();
14 CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read);
15 StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
16 fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
17 fsDecrypted.Flush();
18 fsDecrypted.Close();
19 }
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五、完整代码
1 ///
2 /// 文件加密
3 ///
4 public class FileSecretHelper
5 {
6 ///
7 /// 密钥，这个密码可以随便指定
8 ///
9 public static string sSecretKey = "?\a??64(?";
10
11 ///
12 /// 调用该函数从内存中删除的Key后使用
13 ///
14 [DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
15 public static extern bool ZeroMemory(IntPtr Destination, int Length);
16
17
18 ///
19 /// 生成一个64位的密钥
20 ///
21 /// string
22 public static string GenerateKey()
23 {
24 //创建对称算法的一个实例。自动生成的密钥和IV。
25 DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
26
27 // 使用自动生成的密钥进行加密。
28 return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
29 }
30
31 ///
32 /// 加密文件
33 ///
34 /// 待加密的文件的完整路径
35 /// 加密后的文件的完整路径
36 public static void EncryptFile(string sInputFilename, string sOutputFilename)
37 {
38 FileStream fsInput = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
39
40 FileStream fsEncrypted = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);
41 DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
42 DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
43 DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
44 ICryptoTransform desencrypt = DES.CreateEncryptor();
45 CryptoStream cryptostream = new CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write);
46
47 byte[] bytearrayinput = new byte[fsInput.Length];
48 fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
49 cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
50
51 cryptostream.Flush();
52 fsInput.Flush();
53 fsEncrypted.Flush();
54 cryptostream.Close();
55 fsInput.Close();
56 fsEncrypted.Close();
57 }
58
59 ///
60 /// 解密文件
61 ///
62 /// 待解密的文件的完整路径
63 /// 解密后的文件的完整路径
64 public static void DecryptFile(string sInputFilename, string sOutputFilename)
65 {
66 DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
67 DES.Key = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
68 DES.IV = ASCIIEncoding.ASCII.GetBytes(sSecretKey);
69
70 FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
71 ICryptoTransform desdecrypt = DES.CreateDecryptor();
72 CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read);
73 StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
74 fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
75 fsDecrypted.Flush();
76 fsDecrypted.Close();
77 }
78 }
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